Dust bag



FIG. 1 is a front perspective view of a dust bag, showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a rear view thereof. 

CLAIM The ornamental design for a dust bag, as shown and described. 